There have recently been several questions in the CQD (Charlie Trout) that discuss using fitting connectors (EMT, flex, sealtite), which normally have untapered threads, with rigid couplings, which have tapered threads. Someone from UL wrote in that fittings are only evaluated by UL in sheetmetal enclosures with locknuts. They are not listed for use with rigid couplings or hubs. The primary reason given is that they will not mate for a moisture tight connection, but also that they may possibly not assure an effective ground path. In any case, fittings are not listed for use with threaded hubs, which includes Meyers hubs, condulets, Bell and other cast boxes.
This is making me feel like the days of the double nickle speed limit, when any car could be pulled over at any time because everyone broke the speed limit. If people can afford to pay electricians to pipe everything in GRC great, but as things stand virtually every installation I see is in violation. What am I missing here? Are manufacturers going to begin to manufacture tapered thread fittings and list them for use in hubs?
This is making me feel like the days of the double nickle speed limit, when any car could be pulled over at any time because everyone broke the speed limit. If people can afford to pay electricians to pipe everything in GRC great, but as things stand virtually every installation I see is in violation. What am I missing here? Are manufacturers going to begin to manufacture tapered thread fittings and list them for use in hubs?